Kidney Failure: Causes, Symptoms, and Treatments

Kidney failuremeans that the kidneys cannot perform their normal functions. They filter waste and excess fluid from the body and excrete them in urine. They also regulate blood pressure, maintain mineral balance, and support blood cell production. When kidney failure develops, harmful wastes and fluids accumulate and may damage vital organs. Kidney failure sometimes develops suddenly; this rapidly developing condition is called acute kidney failure . The form that progresses slowly over years is called chronic kidney failure . In both, early diagnosis and treatment are very important for improving quality of life and preventing serious complications.

What Is Kidney Failure?

Kidney failure is a serious health problem in which the kidneys cannot adequately filter waste from the blood. Healthy kidneys clean about 1500 liters of blood daily, removing waste and excess fluid in urine. In kidney failure, function may fall below 15%, disrupting the body's balance. Harmful substances accumulate, fluid and electrolyte balance is disturbed, and other organ systems begin to be affected.

Acute and Chronic Kidney Failure: Kidney failure can occur in two forms:

• Acute kidney failureis a sudden, rapid loss of function, generally developing over days or weeks. It may be reversible with appropriate treatment.
• Chronic kidney failureis a gradual decline in function over months or years. The damage is generally permanent and progressive. At an advanced stage, the kidneys become almost completely unable to function.

What Causes Kidney Failure?

Kidney failure has many causes. Acute cases generally result from a sudden health problem or external factor, while chronic failure develops from long-standing disease. Common causes include:

• Diabetes: Persistently high blood sugar can damage the kidneys' filtration system and lead to chronic failure. Diabetes is one of the most common causes of chronic kidney disease.
• High blood pressure (hypertension): Uncontrolled blood pressure damages kidney blood vessels, causing loss of function. Together with diabetes, hypertension is a leading cause of kidney failure.
• Glomerulonephritis: Inflammation of the kidneys' filtering units, known as glomerulonephritis, and similar inflammatory kidney diseases can damage tissue and cause failure.
• Kidney stones and urinary obstruction: Stones, tumors, or an enlarged prostate that obstruct urine flow for a prolonged period put pressure on the kidneys. Persistent pressure and urine accumulation can cause damage over time.
• Chronic infections: Repeated kidney infections, such as pyelonephritis, can damage tissue and predispose to failure over the long term.
• Long-term use of certain medications: Painkillers, particularly nonsteroidal anti-inflammatory drugs used unnecessarily or without supervision, and some antibiotics can damage the kidneys. Frequent use over years increases failure risk.
• Inherited and congenital conditions: Genetic conditions such as polycystic kidney disease cause cysts and structural abnormalities that can lead to kidney failure over time.
• Other causes: Conditions reducing kidney blood flow—severe dehydration, major blood loss, heart failure, or serious allergic reactions—may cause acute failure. Heavy metal poisoning, chemical toxins, and severe injuries can also suddenly impair kidney function.

Symptoms of Kidney Failure

Kidney failure may initially develop unnoticed, particularly in the early stages of chronic disease. As function falls below a certain level, however, the body begins showing warning signs. Symptoms of kidney failure vary between people, but the most common include:

• Reduced or changed urine output: Passing less urine or darker urine than usual. Some people instead urinate frequently, particularly at night.
• Edema (swelling): When the kidneys cannot remove fluid, it accumulates. Swelling may occur particularly in the legs, ankles, feet, and hands. Facial swelling, especially around the eyes, may be noticeable in the morning.
• Shortness of breath: Excess fluid may collect in the lungs and make breathing difficult. Anemia can also contribute to breathlessness.
• Fatigue and weakness: People with kidney failure may feel constantly tired or exhausted. This results from accumulated toxins and insufficient kidney hormone production, such as erythropoietin deficiency causing anemia.
• Nausea and vomiting: Increased blood waste products such as urea can affect the stomach, causing frequent nausea and vomiting.
• Poor appetite and an unpleasant taste: Patients may struggle to eat and lose their appetite. A metallic or unpleasant taste may develop.
• Muscle cramps and restless legs: Electrolyte imbalances, particularly in potassium, calcium, and sodium, can cause muscle cramps, especially in the legs.
• Dry, itchy skin: When waste is not removed, skin may become dry and very itchy. Some patients develop a grayish or pale skin tone.
• Confusion: Advanced kidney failure, particularly with very high toxin levels, can cause forgetfulness, poor concentration, or absent-mindedness. In very advanced cases, drowsiness or loss of consciousness (coma) may occur.
• Chest pain and heart rhythm problems: Kidney failure also affects the heart. Fluid accumulation around the heart in the pericardium may cause chest pain. Electrolyte imbalances can also cause abnormal rhythms (arrhythmias).

The number and severity of symptoms depend on whether failure is acute or chronic and on its stage. Some people with chronic disease have no obvious symptoms until function is severely reduced. Regular checks are therefore very important for those at risk.

Risk Factors for Kidney Failure

Some people are at greater risk of developing kidney failure. Knowing the risk factorshelps you take early steps to protect kidney health. The main factors include:

• People with diabetes or hypertension: Compared with healthy people, those with diabetes or high blood pressure face a greater risk. Poorly controlled chronic conditions damage the kidneys over time.
• People over 60: Kidney function naturally declines somewhat with age. Older people have a higher likelihood of chronic kidney disease.
• Family history of kidney disease: A first-degree relative such as a parent or sibling with chronic kidney disease or kidney failure may indicate increased risk through genetic predisposition.
• Obesity (excess weight): Obesity indirectly increases failure risk by raising the likelihood of diabetes, hypertension, and heart disease. It can also directly increase kidney workload.
• Smoking and alcohol use: Smoking damages kidney blood vessels and increases chronic disease risk. Excess alcohol can impair liver and kidney function, contributing to failure.
• Long-term medication use: Prolonged use of painkillers, anti-inflammatory drugs, or certain antibiotics without medical supervision can allow toxic effects to accumulate and damage the kidneys.
• Other chronic diseases: People with heart failure, liver failure, autoimmune disease such as systemic lupus, or frequent urinary infections are also at risk. These conditions can directly or indirectly increase kidney workload.

People with these risk factors should pay extra attention to kidney health and maintain regular health checks.

Stages of Kidney Failure

Chronic kidney failure is classified into 5 stages according to loss of filtration function. Stages are based on glomerular filtration rate (GFR), which indicates how much blood the kidneys filter each minute. Without going into complex technical details, the stages can be summarized as follows:

Note: Stage 5 is also called “end-stage kidney disease.” At this stage, failure is life-threatening and requires urgent treatment.

This classification applies only to chronic failure. Acute failure is assessed differently, according to its cause and the patient's condition. In early chronic disease (Stage 1-2), progression can be slowed, whereas Stage 4-5 requires renal support therapies to maintain vital functions.

How Is Kidney Failure Diagnosed?

Several tests and methods are used. After taking a history and performing an examination, the doctor uses the following tools to assess kidney function:

• Blood tests: Kidney function indicators such as creatinine and urea (BUN) are measured. When the kidneys function poorly, these exceed normal levels. Electrolytes such as sodium, potassium, and calcium and a complete blood count are also checked.
• Urinalysis: Checks urine for protein, blood, glucose, or infection. Protein leakage, or proteinuria, may be an early sign of kidney damage. A 24-hour urine collection can also assess urine production and waste excretion.
• Imaging: Ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI) provide information about kidney structure and size, and identify stones, tumors, or urinary obstruction.
• Kidney biopsy: A biopsy may be needed if diagnosis is unclear or to identify the cause. A thin needle takes a small tissue sample for examination under a microscope. This is particularly informative for specific diseases such as glomerulonephritis.

Together, these tests can identify whether failure is present, its severity, and its likely cause. Early diagnosis allows prompt measures to slow loss of function.

Treatments for Kidney Failure

Treatment aims to preserve remaining function as much as possible, prevent waste accumulation, and improve quality of life. It varies according to whether failure is acute or chronic and its stage. In general, kidney failure treatments fall into the following categories:

• Treating the underlying cause: The first step is to address the main problem. For hypertension-related failure, controlling blood pressure with medication matters; for diabetes, blood sugar control is important. An obstructing stone may need removal, or an infection may require treatment.
• Diet and lifestyle changes: Patients need to pay attention to diet. Salt restriction,control of excess fluid intake, and foods low in potassium and phosphorus are recommended. Protein is generally controlled because excess intake can burden the kidneys. Patients who smoke should quit and should limit alcohol. Regular light exercise supports circulation and general health, indirectly benefiting kidney function.
• Medication: No drug completely cures kidney failure itself, but medicines manage complications. Antihypertensives control blood pressure; erythropoietin injections or iron address anemia; and vitamin D and calcium supplements support bone health. Diuretics remove excess fluid to reduce edema and high blood pressure.
• Dialysis: In advanced failure, usually Stage 5, a machine may need to perform the filtration the kidneys cannot. Dialysis removes accumulated waste and excess fluid. There are two main types:
  • Hemodialysis: The patient generally attends a dialysis center 2-3 times a week and connects to a machine. Special filters clean the blood and return it to the body.
  • Peritoneal dialysis: A permanent catheter is placed in the abdomen. Special fluid is introduced and drained, using the abdominal lining as a filter to clean the blood. Patients can usually perform it themselves at home.
• Kidney transplantation: The most effective, lasting treatment for end-stage failure is surgically transplanting a healthy kidney from a suitable donor. A successful transplant removes dependence on dialysis and allows life with a healthy kidney. Finding a donor may take time, and lifelong immunosuppressive medication is required afterward. These drugs may cause side effects but are essential to keep the transplanted kidney functioning and prevent rejection.
• Supportive treatments: These address common problems in kidney failure. Examples include diuretics for fluid accumulation, appropriate intravenous fluids to correct electrolyte imbalances, and phosphate binders to prevent bone loss. The aims are to improve well-being and prevent complications.

Each treatment plan is individualized. Although chronic failure cannot be fully cured, appropriate treatment can extend life and improve its quality. With prompt, correct treatment, acute failure may show substantial recovery of function.

Preventing Kidney Failure

Healthy habits are essential for preventing failure or slowing progression. Measures to protect kidney health include:

• Have regular health checks: Especially with diabetes or high blood pressure, attend regular medical checks and have blood and urine tests of kidney function. Dysfunction detected early is easier to control.
• Control blood pressure and blood sugar: Because high levels damage the kidneys, work toward targets recommended by your doctor. Take medication consistently when needed and maintain follow-up.
• Drink plenty of water: Adequate water supports healthy kidney function. Aim for 8 glasses (about 2 liters) daily. Water helps waste filter through the kidneys and pass into urine.
• Eat a healthy, balanced diet: Avoid excess salt, aiming to limit daily intake to 5-6 grams. Avoid very high-protein diets and follow a balanced plan. Eat fresh fruit and vegetables, whole grains, and healthy protein sources. Avoiding fast food and processed foods reduces excess salt and additives that may harm the kidneys.
• Use medication carefully: Do not take medication frequently over long periods without medical advice. Avoid unnecessary use of common drugs such as painkillers and antibiotics. Ask your doctor whether prescribed medicines affect your kidneys.
• Exercise regularly: Aim for 30 minutes of moderate exercise at least 3 days a week, such as walking, light jogging, cycling, or swimming. Exercise improves circulation, helps control blood pressure and blood sugar, and maintains a healthy weight.
• Avoid smoking and alcohol: Quitting smoking is very important for all organs, including the kidneys. Smoking narrows kidney blood vessels and impairs blood flow. Keep alcohol moderate, as excessive intake harms kidney and liver function.
• Manage risk factors: Take diabetes, high blood pressure, obesity, and other risk factors seriously and make a management plan with your doctor. Steps may include diabetes education, dietitian support, or regular home blood pressure monitoring.

These measures improve general health as well as reduce kidney failure risk. The kidneys are the body's filtration system; caring for them is an investment in a long, healthy life.

Frequently Asked Questions

Question: What helps kidney failure?
No single remedy completely resolves kidney failure, but appropriate treatment and lifestyle changes can help greatly. Restricting salt, drinking plenty of water, and controlling blood pressure and blood sugar support the kidneys. Following prescribed diets and medicines and avoiding activities that place excessive strain also help. In advanced disease, dialysis or transplantation are the most important measures needed for survival.

Question: How can you recognize kidney failure? What are its first symptoms?
Early failure may cause no symptoms or only mild ones. Initial signs may include reduced urine, frequent nighttime urination, unexplained fatigue, poor appetite, or mild ankle swelling. Rising creatinine and urea on blood tests are also early signs of impaired function. If these occur or you are at risk, consult a doctor and have the necessary tests.

Question: Who most often develops chronic kidney failure?
It most commonly develops in people with diabetes and hypertension, particularly after many years. Risk is also higher in people over 60, those with obesity or a family history of kidney disease, and smokers. Regular screening is crucial for early diagnosis in these groups.

Question: Which doctor or department treats kidney failure?
If kidney failure is suspected, consult a doctor specializing in nephrology , the field responsible for diagnosing and treating kidney disease. If no nephrologist is available locally, an internal medicine specialist can assess you initially and refer you when needed.

Question: Can kidney failure recover completely?
Acute failure often improves with appropriate treatment, and function may return close to normal. Chronic failure is generally permanent and cannot be fully cured; the aim is to slow progression and control symptoms. In end-stage failure, a healthy transplanted kidney may allow a near-normal life, although ongoing medical follow-up remains necessary.

Question: Is a kidney transplant or dialysis better?
When a suitable donor is available, transplantation is considered the most effective long-term option. After a successful transplant, patients can live normally for years with a healthy kidney. Dialysis partly replaces kidney function and requires hospital attendance several times a week. Transplantation generally improves quality of life more and provides better long-term outcomes. However, some patients are unsuitable or cannot find a donor immediately. Dialysis therefore serves as a vital bridge and can continue for years when needed. Doctors assess the better option according to general health, age, and preferences.

Conclusion

Awareness of kidney failure and early precautions are important for a healthy life. If you have symptoms or risk factors, seek the necessary checks at a healthcare facility. The kidneys are unsung heroes that often go unnoticed while healthy; protecting them is in your hands.